Subaru Subaru Legacy 2010-2014 Exhaust System Bolt Torque Specifications
Detailed torque specifications for the exhaust bolts of the 2010-2014 Subaru Legacy, including manifold, downpipe, and flange bolts.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
Always use a calibrated torque wrench and follow specifications exactly.
Incorrect Torque Sequence
Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
Clean and inspect all threads before assembly. Use new thread locker if specified.
Reusing TTY Bolts
Torque-to-yield bolts are designed to stretch and must not be reused.
Always replace TTY bolts with new ones. They are single-use only.
Dry vs. Lubricated
Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
Search Specifications
Search by component name, bolt size, or description
Torque Calculator
Convert between different torque units
Exhaust Manifold
This subsystem includes components that connect the exhaust manifold or headers to the cylinder head and exhaust pipe. Proper torque ensures a tight seal to prevent exhaust leaks and maintains system integrity.
1 Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25
Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25Torque Value
Important Notes
2 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M10 x 1.5Torque Value
Important Notes
Catalytic Converter
This subsystem includes components that connect the catalytic converter to the exhaust pipe. Proper torque ensures a tight seal and prevents exhaust leaks, which is critical for emissions control.
1 Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5
Catalytic Converter to Exhaust Pipe Bolts
M10 x 1.5Torque Value
Important Notes
Muffler
This subsystem includes components that connect the muffler to the exhaust pipe. Proper torque ensures a secure fit and prevents exhaust leaks, reducing noise and maintaining backpressure.
1 Muffler to Exhaust Pipe Bolts
M10 x 1.5
Muffler to Exhaust Pipe Bolts
M10 x 1.5Torque Value
Important Notes
Heat Shield
This subsystem includes components that protect surrounding components from heat. Proper torque ensures heat shields remain securely fastened without over-tightening.
1 Exhaust Heat Shield Bolts
M6 x 1.0
Exhaust Heat Shield Bolts
M6 x 1.0Torque Value
Important Notes
Hanger
This subsystem includes components that support the weight of the exhaust system and prevent excessive movement. Proper torque ensures hangers remain securely attached without over-tightening.
1 Exhaust Hanger Bolts
M8 x 1.25
Exhaust Hanger Bolts
M8 x 1.25Torque Value
Important Notes
Oxygen Sensor
This subsystem includes components that monitor exhaust gases and ensure proper engine performance. Proper torque ensures a secure fit and prevents leaks, which could affect sensor readings and emissions.
1 Oxygen Sensor
M12 x 1.5
Oxygen Sensor
M12 x 1.5Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Loose Components
Symptoms:
- Rattling or vibration noises
- Visible movement in components
- Uneven panel gaps
Solutions:
- Clean threads and mounting surfaces
- Replace damaged fasteners
- Apply proper torque in sequence
- Use thread locker if specified
Stripped Fasteners
Symptoms:
- Unable to achieve proper torque
- Fastener spins freely
- Visible thread damage
Solutions:
- Use thread repair kit if appropriate
- Install thread insert (HeliCoil)
- Replace component if threaded hole is damaged
- Upgrade to higher grade fastener if recommended
Overtightened Components
Symptoms:
- Cracked or deformed parts
- Broken fasteners
- Compressed gaskets or seals
Solutions:
- Replace damaged components
- Use new fasteners
- Follow proper torque sequence
- Verify correct torque specifications
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Visual Inspection
Inspect the affected area for any visible signs of damage or wear
- Check for cracks or deformation
- Look for signs of excessive wear
- Verify proper fastener installation
Torque Verification
Verify the torque applied to the fasteners
- Check the torque wrench calibration
- Verify the torque specification
- Compare the applied torque to the specification
Thread Assessment
Assess the condition of the threads
- Check for signs of thread damage
- Verify the thread type and size
- Check for proper thread engagement
Prevention Guidelines
Best practices, maintenance tips, tool care
Prevention Guidelines
Best practices, maintenance tips, tool care
Best Practices
- Always follow the recommended torque specification
- Use the correct type and size of fasteners
- Verify the torque wrench calibration regularly
Maintenance Tips
- Regularly inspect the affected area for signs of wear or damage
- Replace damaged or worn-out components promptly
- Keep the work area clean and organized
Tool Care
- Regularly clean and maintain the torque wrench
- Store the torque wrench in a dry and secure location
- Verify the torque wrench calibration before each use
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the torque specification for the exhaust manifold bolts on a 2010-2014 Subaru Legacy?
What is the torque specification for the exhaust manifold bolts on a 2010-2014 Subaru Legacy?
The torque specification for the exhaust manifold bolts on a 2010-2014 Subaru Legacy is typically 26-30 ft-lbs (35-40 Nm). Always refer to the vehicle's service manual for the exact specifications, as variations may exist depending on the engine model.
Q2 Can I reuse exhaust bolts after removal?
Can I reuse exhaust bolts after removal?
It is generally not recommended to reuse exhaust bolts, as they are often subjected to high heat and stress, which can weaken them over time. Reusing old bolts may lead to leaks or failure. Always use new bolts and gaskets when reassembling the exhaust system.
Q3 What happens if I over-torque the exhaust bolts?
What happens if I over-torque the exhaust bolts?
Over-torquing exhaust bolts can cause the bolts to stretch or break, damage the exhaust manifold or flange, or strip the threads in the cylinder head. This can lead to exhaust leaks, increased emissions, and potential engine performance issues.
Q4 How often should I check the torque on my exhaust bolts?
How often should I check the torque on my exhaust bolts?
It is a good practice to check the torque on exhaust bolts during routine maintenance, such as when replacing the exhaust system or performing an engine tune-up. If you notice any exhaust leaks or unusual noises, inspect the bolts immediately.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature can significantly impact torque values and fastener behavior
Cold Weather
Effects:
- Increased material brittleness
- Higher torque required due to thread contraction
- Reduced thread lubricant effectiveness
Recommendations:
- Allow components to warm to room temperature when possible
- Consider using winter-grade thread lubricants
- Check torque values more frequently during winter months
Hot Weather
Effects:
- Thermal expansion of components
- Decreased friction in threads
- Accelerated lubricant breakdown
Recommendations:
- Check torque when components are at normal operating temperature
- Use temperature-resistant thread lockers
- Consider re-torquing after heat cycles
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Moisture and corrosion can affect fastener integrity and torque values
High Humidity
Effects:
- Accelerated corrosion formation
- Reduced friction coefficient
- Potential thread seizing
Prevention:
- Use corrosion-resistant fasteners
- Apply appropriate anti-seize compounds
- Maintain proper protective coatings
Salt Exposure
Effects:
- Rapid corrosion development
- Thread damage
- Seized fasteners
Prevention:
- Regular underbody washing
- Use of sacrificial anodes where appropriate
- Application of protective coatings
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Spring
- Inspect for winter damage
- Clean and protect exposed fasteners
- Check torque on critical components
Summer
- Monitor heat-affected components
- Check expansion-related loosening
- Inspect cooling system mounts
Fall
- Prepare for winter conditions
- Apply corrosion protection
- Verify all fasteners are properly torqued
Winter
- More frequent inspection of critical fasteners
- Check for salt damage
- Monitor suspension component torque
Related Resources
Tools, service procedures, and technical bulletins
Recommended Tools
Torque Wrench
A precision tool used to apply a specific torque to a fastener, such as exhaust bolts.
- Adjustable torque settings
- Durable construction for automotive use
Socket Set
A set of sockets compatible with exhaust bolt sizes, typically in metric measurements.
- Includes 12mm, 14mm, and 17mm sockets
- Made from chrome vanadium steel
Breaker Bar
A long-handled tool used to loosen tight bolts before applying torque.
- High leverage for tough bolts
- Durable steel construction
Service Procedures
Exhaust Manifold Bolt Torque Procedure
Step-by-step guide to properly torque the exhaust manifold bolts on a 2010-2014 Subaru Legacy.
- Ensure the engine is cool before starting.
- Remove the heat shield and any components obstructing access to the exhaust manifold.
- Loosen the exhaust manifold bolts using a breaker bar and appropriate socket.
- Clean the bolt threads and mating surfaces to ensure proper torque application.
- Tighten the bolts in a crisscross pattern to the specified torque of 26-30 ft-lbs (35-40 Nm).
- Reinstall the heat shield and any removed components.
Exhaust Pipe Flange Bolt Torque Procedure
Procedure for torquing the exhaust pipe flange bolts on a 2010-2014 Subaru Legacy.
- Raise the vehicle and secure it on jack stands.
- Locate the exhaust pipe flange near the catalytic converter.
- Loosen the flange bolts using a socket and breaker bar.
- Clean the flange surfaces and bolt threads.
- Tighten the bolts to the specified torque of 22-26 ft-lbs (30-35 Nm).
- Lower the vehicle and test for exhaust leaks.
Technical Service Bulletins
Exhaust Manifold Bolt Loosening Issue
2012-05-15Reports of exhaust manifold bolts loosening over time, leading to exhaust leaks.
Resolution: Apply thread locker to the exhaust manifold bolts during installation and ensure proper torque is applied.
Exhaust Flange Gasket Failure
2013-08-22Some vehicles may experience exhaust flange gasket failure due to improper torque or corrosion.
Resolution: Replace the gasket and ensure the flange bolts are torqued to the correct specification of 22-26 ft-lbs (30-35 Nm).
About the Author
Expert automotive knowledge and experience
'/%3E%3Cpath d='M60 30a20 20 0 1 1 0 40 20 20 0 0 1 0-40zm0 45c16.5 0 30 7.5 30 16.8V100H30v-8.2c0-9.3 13.5-16.8 30-16.8z' fill='%23404040'/%3E%3C/svg%3E)
Diagnostic
Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.
Repair
Expert in both traditional mechanical repairs and modern vehicle systems.
Additional Expertise
Documentation
Created over 500 detailed repair guides and technical documents.
Training
Conducted technical training sessions and contributed to repair databases.
Certifications & Research
Certifications
- ASE Master Technician Certification
- Advanced Diagnostic Specialist
- Hybrid/Electric Vehicle Systems
- Performance Tuning Expert
Research & Community
Actively researches emerging technologies and contributes to automotive forums.
Legal Disclaimer
Important information about using this content
Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.
General Information
Warranty & Liability
The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.